Gas fuel filling and supplying system

Abstract

A gas fuel filling and supplying system includes: a tank; a filling pipe having a filling port; a supplying pipe; a branch pipe that branches from a connection part between the filling pipe and the supplying pipe and is connected to the tank; a normally closed solenoid value provided in the branch pipe; and a control part that controls opening and closing of the solenoid valve, wherein the control part controls the solenoid valve to be in an open state while a gas engine is driven, controls the solenoid valve to be in a closed state while the gas engine is stopped, and controls the solenoid valve to be in an open state during filling of the tank with gas fuel from the filling port.

1 . A gas fuel filling and supplying system comprising:
 a tank that stores gas fuel;   a filling pipe provided with a filling port for the gas fuel at an upstream end;   a supplying pipe having an upstream end connected to a downstream end of the filling pipe and a downstream end connected to an injector facing an intake passage of a gas engine;   a branch pipe that branches from a connection part between the filling pipe and the supplying pipe and is connected to the tank;   a normally closed solenoid valve provided in the branch pipe; and   a control part that controls opening and closing of the solenoid valve, wherein the control part controls the solenoid valve to be in an open state while the gas engine is driven, controls the solenoid valve to be in a closed state while the gas engine is stopped, and controls the solenoid valve to be in an open state during filling of the tank with the gas fuel from the filling port.   
     
     
         2 . The gas fuel filling and supplying system according to  claim 1 , further comprising:
 a detection means that detects insertion of the fuel nozzle into the filling port and removal of the fuel nozzle from the filling port, wherein   
       the control part controls the solenoid valve to be in an open state when the detection means detects the insertion of the fuel nozzle, and controls the solenoid valve to be in a closed state when the detection means detects the removal of the fuel nozzle. 
     
     
         3 . The gas fuel filling and supplying system according to  claim 2 , further comprising:
 an engine switch that transmits a signal indicating running or stoppage of the gas engine to the control part; and   a battery, wherein   
       the solenoid valve includes an electromagnetic coil, and 
       the control part controls the solenoid valve to be in an open state by supplying a current from the battery to the electromagnetic coil when the detection means detects the insertion of the fuel nozzle while receiving a signal indicating stoppage of the gas engine from the engine switch. 
     
     
         4 . The gas fuel filling and supplying system according to  claim 3 , wherein the control part determines whether the detection means has detected the removal of the fuel nozzle while controlling the electromagnetic coil to be energized and the solenoid valve to be in the open state due to the detection means detecting the insertion of the fuel nozzle. 
     
     
         5 . The gas fuel filling and supplying system according to  claim 4 , wherein the detection means detects insertion of the fuel nozzle to the filling port or removal of the fuel nozzle from the filling port by contacting the fuel nozzle.